Percussion Tool Chuck With Pot-Shaped Anvil for Dust Prevention
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Solution Overview
Problem
Existing percussion hand-held power tools fail to prevent dust penetration effectively, especially in dry construction industry settings, as they are not designed for dust-tight operation.
Innovation Solution
A chuck design featuring a receiving sleeve fixedly connected to the power tool for joint rotation and limited axial displacement, with a radially displaceable locking member and a pot-shaped anvil for dust prevention, secured by interference fit or elastic means, and incorporating sealing and rotation-transmitting features to ensure dust-tightness and efficient torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional open chuck design is used, then the structure is simple and easy to manufacture, but dust can penetrate into the interior of the power tool
Solution Approach 1:
The patent combines the chuck body and anvil into a single integrated pot-shaped structure. The anvil is formed as one piece with the chuck body, creating a closed enclosure that prevents dust penetration while maintaining structural simplicity. This merging eliminates the need for separate dust sealing components.
Solution Approach 2:
Instead of adding complex sealing mechanisms to an open chuck design, the patent inverts the approach by making the chuck itself closed and pot-shaped. The traditional open chuck is transformed into an enclosed structure where the anvil forms the closing element, naturally preventing dust entry without additional sealing components.
2Object-affected harmful factors
If the anvil is fixedly secured by interference fit, then dust-tightness is achieved, but the transmission of blow pulses to the working tool is reduced
Solution Approach 1:
The patent applies different connection methods to different parts of the anvil. The front surface of the anvil that contacts the working tool is made spherical and smooth to ensure optimal blow pulse transmission, while the rear connection surface uses interference fit or elastic securing to achieve dust-tightness. This local differentiation of connection qualities resolves the contradiction between sealing and force transmission.
3Ease of operation
If the receiving sleeve is made axially displaceable for limited movement, then the locking mechanism can function properly, but dust-tightness is compromised
Solution Approach 1:
The patent employs a diaphragm seal (flexible membrane) to close the rear opening of the receiving sleeve. This flexible diaphragm allows the receiving sleeve to displace axially for locking mechanism operation while maintaining dust-tightness. The diaphragm flexes with the sleeve movement but prevents dust penetration, resolving the contradiction between operational displacement and sealing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents dust penetration and ensures efficient transmission of blow pulses to the working tool, maintaining tool integrity and performance in dusty environments.
Implementation Method 1
a percussion piston, which is driven by a pneumatic percussion mechanism applies blows to an axially displaceably supported anvil that, in turn, applies blows to the power tool side end surface of the shank
Implementation Method 2
the anvil can be elastically secured in the receiving sleeve by an elastic intermediate layer, e.g., by vulcanization. Thereby, the blow pulses applied to the free end of the anvil are decoupled from the receiving sleeve to a most possible extent and, thereby, almost completely transmitted to the working tool
Implementation Method 3
the anvil is fixedly secured in the receiving sleeve by interference fit, e.g., by being shrinked, or by material-locking connection with glue, soldering
Data Source
AI summary
A hand-held power tool for at least percussively driving a working tool (2) along a percussion axis (A) and including a chuck (4) for receiving the working tool (2) and including a receiving sleeve (6, 6′) fixedly connected with the chuck (4) for joint rotation therewith and for limited axial displacement relative thereto, at least one locking member (7) radially displaceably supported in the receiving sleeve (6, 6′) for axially securing therein a shank (3, 3′) of the working tool (2) insertable in to the receiving sleeve (6, 6′), and an axially extending anvil (8) securable in the receiving sleeve (6, 6′) for closing a power tool side end of the receiving sleeve (6, 6′).